I just bought a Trail Lite B+ 211s with 8.1 Chevy engine. This is my fifth motorhome (others range from an old 20' Vagabond, and three Winnegagos, from 19 to 32'. This vehicle is fantastic. I am...
I always pay to get our unit winterized and dewinterized because I want to make sure it's totally done correctly (since our winters are so long), so I know nothing about drain rings. I don't mess with them at all.
I must admit I'm kind of chuckling over your definition of a "hard freeze." Up here we think a hard freeze is when it's about -25º for a few weeks. :)